Matthew Vaughn’s Kick-Ass isn’t going to be in theaters for over a month, but it premiered last night at the 2010 South by Southwest Film Festival to huge success. When ComingSoon.net/SuperHeroHype spoke with the movie’s stars, Aaron Johnson and Christopher Mintz-Plasse, we weren’t too surprised to learn there’s already talk about a Kick-Ass 2 at least in terms of a second volume from creators Mark Millar and John Romita Jr.

We’ll have a full review soon, but what’s interesting about Vaughn’s movie is that it starts and ends almost exactly like the first 8-issue volume of the comic series, so it essentially leaves Vaughn in a place where he could take what Millar and Romita do in a second volume and adapt it directly onto the big screen as a sequel.

Unsurprisingly, the three of them are very much in communication so that a second movie might even be closer to the comic book than the first one.

“Last night at the Q ‘n’ A, someone asked Johnny (Romita Jr.) if they’re going to have some stuff from ‘Kick-Ass 2’ at Comic-Con and they said, ‘Yes,’ which means they’re going to get started on it, which is exciting,” Mintz-Plasse told us in an exclusive interview.

“Matthew and Mark have a lot of ideas, and I think they work quite tightly,” Johnson added.

Mintz-Plasse gave us a little hint where they might be taking the second volume and hopefully a second movie. “I met up with Mark actually a few months ago and we had a couple drinks and he told me it was going to be great, and he wants it to be very, very dark is what he’s thinking.”

“If you could get any more dark than ‘Kick-Ass’ is right now, then Mark had even darker ideas,” Johnson confirmed. “Matthew went with absolutely everything but there were some things that were impossible to film. No one’s going to see it because it’s too disgusting.”

“It’s way too much yeah,” Chris concluded.

Of course, they could just as well have been talking about Kick-Ass, which opens on April 16. You can read more from our interview with Aaron and Christopher (plus hopefully some more interviews) closer to then.